How and were do I find the engine control module on a 2005 Buick rendezvous ultra 3.6?

already answered here, 26 or 29 :>D

What are the torque specs for crankshaft main and rod - Fixya

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Sept 21, 2012 - The connecting rods torque to 29 foot pounds. ... Where is the eng control module in a 2005 Buick Rendezvous ultra 3.6 eng.
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Do you know that a replacement ECM would need programming ? Dealer .An it's a PCM - powertrain control module ,because transmission an engine modules are inside the same box (module) .Service of the PCM should normally consist of either replacement of the PCM or EEPROM programming. If the diagnostic procedures call for PCM replacement, inspect the PCM first to see if the PCM is the correct part. If the PCM is faulty, remove the PCM and install the new service PCM.
The new service PCM will not be programmed. You must program the new PCM. DTC P0602 indicates the EEPROM is not programmed or has malfunctioned.
There are no user serviceable parts in this PCM. The PCM should never be opened for any reason.
Important: When replacing the production PCM with a service PCM (controller), it is important to transfer the broadcast code and production PCM number to the service PCM label. Do not record this information on the PCM cover. Transfer allows positive identification of PCM parts throughout the service life of the vehicle.

Disconnect the negative battery cable. Refer to Battery Negative Cable Disconnection and Connection in Engine Electrical.
Remove the left sheet metal diagonal brace. Refer to Front End Sheet Metal Diagonal Brace Replacement - Left Side in Body Front End.
Remove the air cleaner assembly cover and lift the PCM from the assembly.
Disconnect the harness connectors from the PCM.
Remove the PCM from the engine compartment.

What module did you replace ? Was the vehicle transmission shifting OK ? The gauge is controlled by a stepper motor inside the instrument cluster , GM had bad stepper motors 03 to 06 .That is probably your problem .

Speedometer
The instrument panel cluster (IPC) displays the vehicle speed as determined by the engine control module (ECM)/powertrain control module (PCM). The ECM/PCM converts the data from the vehicle speed sensor to a 4,000 pulses/mile signal. The IPC uses the vehicle speed signal circuit (4,000 pulses/mile), class 2 message from the ECM/PCM in order to calculate the vehicle speed. If the IPC detects a malfunction in the vehicle speed signal circuit from the ECM/PCM, the IPC uses the class 2 message from the EBCM, indicating the vehicle speed as a backup. If the speedometer reaches (108 mph) the fuel will shut-off, and it will turn back ON when the speedometer is at (106 mph). The speedometer displays either miles or kilometers as requested by the activation of the english/metric button on the driver information center (DIC). The associated indicator (km/h or mph) illuminates.

How to repair GM Instrument Cluster Speedometer Gauge Stepper

No door lock module , BCM - body control module ! You best bet would be to take your vehicle to a qualified repair shop an have your problem diagnosed . If you replace the module it has to go to the dealer to be programed .

check the video although it od 2002 model.

2002 2005 Buick Rendezvous body control module BCM Genuine OEM...

ECM PCM Replacement 2005 Buick Rendezvous Ultra Repair Manual Download Filepeep com

Could be on the bell housing gear box area or front harmonic balancer?

Speedometer and/or Odometer Inaccurate or Inoperative
Test Description
The number below refers to the step number on the diagnostic table.

1. This test procedure may cause DTCs to set, which may cause other systems to be inoperative or disabled.

Step

Action

Yes

No

Schematic Reference: Instrument Cluster Schematics
1

Did you perform the Diagnostic System Check - Vehicle?
Go to Step 2
Go to Diagnostic System Check - Vehicle in Vehicle DTC Information

2

1. Install a scan tool.
2. Raise the vehicles drive wheels. Refer to Lifting and Jacking the Vehicle in General Information.
3. Start the engine.
4. Place the transmission into drive.
5. With the scan tool, observe the Vehicle Speed Sensor (VSS) parameter in the engine control module (ECM)/powertrain control module (PCM) Engine Data 1 data list.

Does the VSS parameter match the speedometer display?
Go to Step 3
Go to Step 4

3

Does the odometer operate properly?
Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems
Go to Step 4

4

Replace the instrument panel cluster (IPC). Refer to Control Module References in Computer/Integrating Systems for replacement, setup, and programming.

Did you complete the replacement?
Go to Step 5
--

5

1. Operate the system in order to verify the repair.
2. Use the scan tool in order to clear the DTCs that may have set in other modules during diagnosis.

Did you correct the condition?
System OK
Go to Step 2

It is located in front of the center console...I found a video on utube.. Place your question as you have here.Video is pretty informative.. Good Luck..And GOD BLESS!

Have a good automotive electrical shop check it out for you.